AF1型灯箱（铝制外框，带转角）简介：AF1系列，此系列是我们多年来销往国外的主要机种之一。客户可能也比较容易接受此种机型。 AF1 Type(Aluminous frame with anodized corner) AF1 series (AL Frame, Clip frame with four anodized corner.), this series is a classical product for North American. AF3型灯箱（铝制外框，全盖式）简介：AF3系列也是我公司一款比较成熟的产品。它是前盖式的灯箱。由四枚螺丝侧面锁住前盖。在公共场合比较不容易受到素质较差的人员的破坏。 AF3 Type(Aluminous housing frame) AF3 series (AL Frame, Housing Frame), It is housing frame type with four screws beside the frame, it’s difficult to take the graphic from the light panel if there is no tool. AF4型灯箱（铝制外框，四边开式）简介：AF4系列是四边开的灯箱（Clip Frame），45度拼角，线条简洁流畅。不同与AF1的风格。设计合理，推出后很受客户欢迎，其厚度只有33mm。 AF4 Type(Aluminous clip frame) AF4 series (AL frame, clip frame), the corner is for 45 degree connects, nice appearance and fashion. The thickness is just only 33mm.